W wtusa17 Fish Addict Joined Dec 21, 2019 Messages 811 Reaction score 183 Location New Orleans Jul 13, 2020 #1 I have 20lb of fine gravel. I’m dirting my 20 long. Is it enough to have a cap? I want an inch at the front and an inch and a half at the back. Should I go and buy one 5lb bag to be safe?